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  1. Qt
  2. QTBUG-55778

requestAnimationFrame() invoked too often

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P2: Important P2: Important
    • 5.9.0 Alpha
    • 5.7.0, 5.8.0
    • Quick: SceneGraph
    • None
    • Ubuntu 14.04

      The following code invokes the crank() callback many tens of times per millisecond, and prevents any other content from showing in the application (e.g. the "Hi Mom!" text).

      import QtQuick 2.7
import QtQuick.Window 2.2
Window {
    visible:true; width:100; height:100
    Text { text:"Hi Mom!" }
    Canvas {
        anchors.fill:parent
        Component.onCompleted: crank()
        function crank(){
            console.log(+new Date)
            requestAnimationFrame(crank)
        }
    }
}

      It appears that requestAnimationFrame() is broken and useless.

        For Gerrit Dashboard: QTBUG-55778
        # Subject Branch Project Status CR V
        184377,3 Canvas Item: Prevent polish loop when calling requestAnimationFrame 5.9 qt/qtdeclarative Status: MERGED +2 0

            janichol Andy Nichols
            phrogz Gavin Kistner
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes